Physics - Modern Physics Question with Solution | TestHub

For${}_3^7\mathrm{Li}$nucleus,

Mass defect,$\Delta M=0.042 \mathrm{u}$

∵$1 \mathrm{u}= 931.5 \mathrm{MeV} {\mathrm{c}}^{-2}$

∴$\mathrm{\Delta } \mathrm{M} = 0.042\times 931.5 \mathrm{MeV} {\mathrm{c}}^{-2}$

$=39.1 \mathrm{MeV} {\mathrm{c}}^{-2}$

Binding energy,$E_b=\Delta M{c}^2$

$=\left(39·1\frac{\text{MeV}}{c^2}\right)c^2$

$=39.1 \mathrm{MeV}$

$\text{Binding energy per nucleon},E{}_{bn}=\frac{E{}_b}{A}=\frac{39·1 \mathrm{MeV}}{7}$

$\approx 5·6 \mathrm{MeV}$